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D. E. FELT.

ADDING MACHINE.

Patented Jan. 8, 1889.

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UNITED STATES PATENT OEET DORE E. FELT, OF CHICAGO, ILLINOIS, ASSIGXOR,BY DIRECT AND MESN E ASSIGNMEN' TO HIMSELF AN D ROBERT TARRANT, OF SAMEPLACE.

ADDING-MACHINE.

SPECIFICATION forming T0 (LZZ 1.0710122 it may 0071 0. 37%:

Be it known that Dona E. FELT, a citizen of the United States, residingat Chicago, in the county of (Took and State of Illinois, have inventeda new and useful Improvement in Adding-Machines, of which the followingis a specification.

This invention relates more particularly to the construction of thestop-motion devices for preventing overrotation under the inn pulses ofthe carrying mechanism, and is an improvement upon the devices designedfor that purpose in my invention shown in application No. 230,653.

The nature of the invention fully set forth in the following descriptitmand shown in the accompanying drawings, in the latter of which Figure 1is a partial vertical longitut'linal section of a machine embodying mypresent improvements. Fig. 2 is a front elevation of two adjacentnumeral-wheels and the carrying devices. Fig. 2% is a partial verticalsec tion taken upon the other side of the disk than that. shown in Fig.i. Fig. -.t is an elevation of a numeral-wheel, the parts being rotatedto a different position from that of Fig. 2. Fig. 5 is a side view ofone of the numeral-wheel s, and Fig. t3 is a ClOSS-SOCIJIOH through thesame and its accompanying ratchets, 8:0. Figs. 7 and 8 are detail viewsshowing an improved construction of the de tents for preventingoverrotation .under power received from the keys. Fig. 9 shows amoditied construction, and Fig. 10 a side view of the same.

In said drawings, A represents the numeralare mounted; t,t,theoperating-keys: I'Xthe vibrating segment-levers operated by thekeys; E, the pinions meshing with said levers, and I! the disks,carrying spring dev n'essed )awls see Fi 3.) actin u )Oll 7 D F's lratchets G, rotating the numetal-wheels.

lI represents the stop-levers, struck and operated by the portions ofthe keys projecting through the segmentlevcrs, as shown, and connectedto the vibrating detents i by the rods 71, the detents engaging theequispaced teeth or wires J, secured in the disks j and part of LettersPatent No. 398,034, dated January 8, 1889. Application filed May 31,1887.

Serial No. 239,781. (No model.)

the uumcrahwheels A, and preventing overrotation under the impulsesreceived direct from the keys. The detents and the heads a, with whichthe loops h of rods 7t engage, are integral, the blanks from which theyare out being shown in Fig. 8, and the heads being then bent at rightangles to the plane of the detents. The same is also true ot theprojections 1;: and d upon the detent, one engaging with the pin 6 uponthe lowest one of each series of keys, and the other may engage with thesegment-lever as the latter rises to its normal position, and thusinsure the lift ing of the detent after it has served its office ofstopping the rotation.

Swinging upon horizontal pivots 7. in the cross-liar K are a series ofdepending arms, L, which are t'orked at theirlower ends, so as to ridethe rim of; the disks F. The disks move only in obedience to thesegment-levers and never turn entirely around their axis; but they areprovided at one point with a lateral bend, 11/, in their rims convertingthem into cam-disks, such bend hei ng located so that the arms L will beswung thereby into the lateral position (see Fig. 2) when the disks areat rest. The object of this feature will he made apparent in the nextparagraph.

N are the earrying-levers, each provided with an actuating-sprin g, 7/,an arm, 0, riding upon the cam o, and a pivoted spring-depressed pawl,M. The cams o are attached to the 1m1'1ieral\\'l1eels and graduallyforce the carrying-levers away from the wheels as the time approachesfor the carrying operation to take elt'ect, and the pawls 1i engage withthe wires or teeth .I, already mentioned. Through wheels; I the shaftupon which the wheels 5 actuated by the pawls.

the medium oi the teeth .I and the pawls M the numeral-wheels areactuzited in carrying. The pawls )I also act, in eonj unction with thefeet 9, formed upon the arms L, to stop the numeral-wheels againstovcrrotation when The nature of this stopping operation is fullyapparent from Fig. 3,.vhere the pawl )l is shown as resting upon top ofthe tooth J next in order, with its end against the one last acted uponand the foot (1 sitting down upon the pawl and preventing its rising.This lock, which is in force when the parts are at rest, is releasedwhenever the disks F are rotated, such rotation resulting in moving thearms L from over the pawls M. It is also released by the withdrawal ofthe pawls with the backward movement of their carrying-levers, the pawlsbeing shaped to admit of this withdrawal in a lengthwise directionwithout interfering with the arms or the wheels, and when so withdrawnthe pawls en gage the next teeth J and the wheels may then be carried bythe carrying levers and pawls one number, the stoppage taking effectagain as soon as the pawls have carried such next teeth J to theposition shown in Fig. 3.

Instead of having the arms L forked, so as to be moved in bothdirections by the camdisks F, said disks may be reduced in diameter, asshown in 9 and 10, and the arms be provided with a single leg orextension, 1), upon one side of the disks and the contact between saidleg and the disks be maintained by springs P. In this modification thefeet q lie in a plane tangential to the rim of the disks, where they donot interfere with the latter, as more particularly illustrated in Fig.10.

In setting the wheels preparatory to an adding operation I employ pawlsR, mounted upon the side of cams 0, which engage with the axialprojections '7" when the axis has been rotated to the position occupiedby the pawls, and after such contact the wheels from which the pawls areheld will be rotated with the axis until they have reached the zeroposition. These pawls are hinged upon the cams and are provided withsprings s, mounted upon and secured to their axes, (see Fig. 6,) andthrough such springs are kept in position for duty, though easily thrownout when necessary. In setting, also, it is necessary to first releasethe wheels from the lock caused by the arms L and the carrying-pawls H,and

. this I accomplish in the construction employing the forked arms L by aseries of rotatable cams, S, mounted upon a cross-shaft, 2, extending tothe outside of the box or case in closing the machine and there providedwith some convenient device, which I have not deemed it necessary toillustrate, for operating it, said cams bearing upon the segmentleversand acting, when turned a half-revolution, to depress all said leverssufficiently to carry all the arms L away from the locking position. Thesame result of moving the arms laterally is accomplished with themodified construction shown in Figs. 9 and 10 by a sliding cross-bar, T,having pins '27, engaging with the arms L and adapted to force thelatter laterally againstthe power of the spring P.

By employing the disks j to support one end of the ratchet-teeth J, I amenabled to reduce the ratchets G very materially from the diameterrequired when said teeth were secured in said ratchets G.

Springs on are mounted upon the axis of the pivoted pawls M and act todepress said pawls, and cams 0, located upon the side of thei'rumeral-wheels, are employed to return the arms 0 to the center afterthey have passed the outermost point of cams o.

I claim 1. In an adding-machine, the combination, with thenumeral-wheels and the carrying mechanism, embracing pawls andratchetteeth for actuating said wheels, of a stop for preventingover-rotation by the carrying mechanism, consisting of arms movable intolocking position with said pawls, substantially as set forth.

2. The combination, in an adding-machine,

with the numeral-wheels having eqnispaced teeth J, of the arms L andpawls M, substantially as set forth.

In an adding-machine, the combination, with the numeral-wheels havingequispaced teeth J, of the cam-disks F, the arms L, and pawls M,substantially as set forth.

4. In an adding-machine, the combination, with the numeral-wheels havingthe teeth J and the carrying pawl and lever, of the locking-arm and itsmoving devices, substantially as specified.

5. The combination,in an adding-machine, and with the numeral-wheels andsetting mechanism thereof, of the locking devices consisting of arms Land pawls M and camdisks forreleasing the former, substantially as setforth.

6. The combination, with the stop devices L and M, acting in conjunctionwith ratchetteeth J, of said teeth J, the cam-disks, the pinionsactuating the disks, the segment-levers, and the cams S, substantiallyas and for the purpose specified.

'7. In an adding-machine, the combination, with the numeral-wheel andits carrying mechanism, of a stop for preventing overrotation under theimpulse of the carrying mechanism, consisting of an arm movable intoposition to act with the actuating-pawl of the carrying mechanism inlooking the numeral-wheel, and means for moving said arm out of suchposition at will, substantially as set forth.

8. In an adding-machine, the combination, with the numeral-wheels andtheir carrying mechanism, of a stop device consisting of an arm actingin conjunction with the pawl of the carrying mechanism to lock thenumeralwheels, said pawl being withdrawable from the locking positionfor renewing the carrying operation, substantially as set forth.

9. The locking-dctents 1', having heads a formed on its edges andintegral therewith, in combination with the rods 7L and the stopleversH, substantially as set forth.

DORR E. FELT. lVitnesses:

EDW. S. EVARTS, EDMUND ADCOCK.

